Activate typoscript linter and update TS files

Thomas Löffler requested to merge task/activate-typoscript-linter into develop
  • Change file extensions to .tsconfig and .typoscript
  • Remove obsolete imports (done in template record) -> should be changed in a separate task
  • Remove config for realurl
  • Move TS integration from ext_tables.php to Overrides file
  • Move code to ext_typoscript_* to include code without need of integration

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